A stone found in 1799 by M. Boussard, a French officer of engineers, in an excavation made at Fort St. Julien, near Rosetta. It has an inscription in three different languagesthe hieroglyphic, the demotic, and the Greek. It was erected B.C. 195, in honour of Ptolemy Epiphans, because he remitted the dues of the sacerdotal body. The great value of this stone is that it furnished the key whereby the Egyptian hieroglyphics have been deciphered.